# Electromagnetic Induction & Alternating Currents (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 77 - 80 of 124

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## Question number: 77

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

### Question

The angular disc of copper, with inner radius a and outer radius b is rotating with a uniform angular speed ω, in a region where a uniform magnetic field B along the axis of rotation exists. Then, the emf induced between inner side and the outer rim of the disc is-

### Choices

Choice (4) Response

a.

b.

c.

Zero

d.

## Question number: 78

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

### Question

In an inductor of inductance L = 100 mH, a current of I = 10A is flowing. The energy stored in the inductor is

### Choices

Choice (4) Response

a.

100 J

b.

10 J

c.

1000 J

d.

5 J

## Question number: 79

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

### Question

Voltage (r. m. s) in the secondary coil of a transformer depends upon

(1) Voltage in the primary coil

(2) Ratio of number of turns in the two coils

(3) Frequency of the source

(4) Time-period of the source

Select the correct answers and mark it according to the following

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

## Question number: 80

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

### Question

Two inductors L 1 and L 2 are at a sufficient distance apart. Equivalent inductance when they are connected (i) in series (ii) in parallel are

### Choices

Choice (4) Response

a.

b.

None

c.

d.

f Page